get First Visible Row from JTree - Java Swing

Java examples for Swing:JTree

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Description

get First Visible Row from JTree

Demo Code

/*//  w  w  w . j  a  v  a2s  . c o m
 * Copyright 2003-2011 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;

import javax.swing.JTree;

import java.awt.Rectangle;

public class Main {
    private static int getFirstVisibleRow(JTree tree) {
        Rectangle visible = tree.getVisibleRect();
        int row = -1;
        for (int i = 0; i < tree.getRowCount(); i++) {
            Rectangle bounds = tree.getRowBounds(i);
            if (visible.y <= bounds.y
                    && visible.y + visible.height >= bounds.y
                            + bounds.height) {
                row = i;
                break;
            }
        }
        return row;
    }
}

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